The IRS is tackling a rapidly growing problem — tax-related identity theft. Last year, there were more than 640,000 incidents of tax fraud; most involving the theft of social security numbers to file false tax returns claiming monies due.

If you earn less than $200,000 a year, there’s a strong chance you don’t have to worry about an Internal Revenue Service audit. But if you make more than $1 million annually, the odds have been rising that you’ll be hearing from the tax man.